Microwave waveguide resonator based double negative metamaterial

A new Nonplanar Left-handed propagating medium consisting of asymmetrically placed obstacles coupled into waveguide resonator that produce a negative dielectric permittivity is presented. The necessary negative magnetic permeability is achieved by introducing capacitive gap along the two post conductor perpendicular to each other inside the waveguide. Its properties are derived from its geometrical constitution and matter used. Its narrowband bandwidth and high Q-factor characteristics are achieving by Introducing posts inside waveguide in our proposed structure, it will generates desired resonance at X band, Ku band and Ka band Frequencies are reported. Simulations results demonstrate the realization of DNGMs matched to free-space as well as having superior insertion loss and better return loss compare to traditional one and having high power handling capacity. This post coupled waveguide resonator (PCWR) characteristic can be widely varied by changing the geometrical structure and conductive properties of the inserted posts. Structure is simulated with Ansoft's finite-element High Frequency Structure Simulator (HFFS) tool to demonstrate the characteristics of this resonator using a rectangular waveguide with center frequency at 11.2GHz.